What is CVE-2026-45849?

CVE-2026-45849 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Improper Locking flaw (CWE-667), affecting Linux kernel versions from 6.1.107 onward and patched in 6.1.165, 6.6.128, 6.12.75 and others. CVE-2026-45849 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45849?

CVE-2026-45849 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-45849?

Yes, CVE-2026-45849 has been patched. Fixed versions include 6.1.165, 6.6.128, 6.12.75 and others. If you are running Linux kernel 6.1.107 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45849 actively exploited?

CVE-2026-45849 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Improper Locking (CWE-667)?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/667.html

CVE-2026-45849

Medium

In the Linux kernel, the following vulnerability has been resolved: net: mscc: ocelot: add missing lock protection in ocelot_port_xmit_inj() ocelot_port_xmit_inj() calls ocelot_can_inject() and ocelot_port_inject_frame() without holding the injection group lock. Both functions contain lockdep_assert_held() for the injection lock, and the correct caller felix_port_deferred_xmit() properly acquires the lock using ocelot_lock_inj_grp() before calling these functions. Add ocelot_lock_inj_grp()/ocelot_unlock_inj_grp() around the register injection path to fix the missing lock protection. The FDMA path is not affected as it uses its own locking mechanism.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-06-25

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-667

CVE-2026-45849 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.1.107, 6.6.48, 6.10.7, 6.11 and later are affected. Fixed in 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 6.1.107 ≥ 6.6.48 ≥ 6.10.7 ≥ 6.11

Fixed in

✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.14 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

6 total

Kernel Git
https://git.kernel.org/stable/c/026f6513c5880c2c89e38ad66bbec2868f978605

Patch
Kernel Git
https://git.kernel.org/stable/c/0b217a40156f497e09dd20d3f7baec40c785f386

Patch
Kernel Git
https://git.kernel.org/stable/c/51c32ae7fae14552d79f7139614b77c1bbd57a48

Patch
Kernel Git
https://git.kernel.org/stable/c/63da961381e0d979459dede713001f8452364477

Patch
Kernel Git
https://git.kernel.org/stable/c/7ac58d8832802ec89baa7539e13e6d58a88cce04

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2026-45849

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-06-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45849?

CVE-2026-45849 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 6.1.107 onward and has been patched in 6.1.165, 6.6.128, 6.12.75 and others. CVE-2026-45849 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45849?

CVE-2026-45849 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-45849?

Yes. CVE-2026-45849 has been patched. Fixed versions include 6.1.165, 6.6.128, 6.12.75 and others. If you are running Linux kernel 6.1.107 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45849 actively exploited?

No. CVE-2026-45849 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.